IntelliTechs ยท Oct 22, 2026
Before you trust a new card with photos you can't replace, run a capacity test. A fake card claims 256 GB but holds only a fraction and silently overwrites files.
A counterfeit card is programmed to tell your computer or phone that it holds, say, 256 GB when it holds far less.
According to MakeUseOf, some clues show up at purchase:
H2testw is free and needs no installation. It fills all free space with files, then reads them back to compare.
FakeFlashTest has two options. "Quick Size Test" writes and reads 512 bytes in random segments of the card and is much faster.
F3 (Fight Flash Fraud) is the option for anyone not on Windows. Per its documentation it runs from the command line, and there are graphical front ends: F3X on macOS and F3-qt on Linux.
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